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This patch remembers the device model pid across xend restarts and avoids creating duplicate device model processes. Also, device models don't inherit socket fds from xend (which are closed on exec now), which used to prevent xend restarting. Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Xiaohui Xin <xiaohui.xin@intel.com> Signed-off-by: Arun Sharma <arun.sharma@intel.com>